RE: [CAD_CAM_EDM_DRO] GECKO resistors

Thanks guys - yes, I meant 2.8Amps - oops - and your trivia makes sense,
once stated, Lou - didn't really think of it before that tho. Shud be up and
running in AM.

Chuck Merja
Actually (a little bit of trivia) ...

The values you will most likely find for a 2900 ohm resistor will lie
between one of two ranges: 2755 to 2842 and and 2958 to 3045. There is a
hole between 2842 and 2958 because 2% (and higher) precision resistors
are cherry-picked from the manufacturing run.

Lou

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ] On Behalf Of Andy Wander
Sent: Tuesday, November 22, 2011 3:10 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ; geckodrive@yahoogroups.com
<mailto:geckodrive%40yahoogroups.com>
Subject: RE: [CAD_CAM_EDM_DRO] GECKO resistors

I guess you mean the motors are 2.8A?

I think you will be fine with the 2.9K resistor.

Note that the specs call for a 2.8K 5% resistor, meaning it could
actually measure anywhere from 2.66K to 2.94K ohms.

If you have a good ohmmeter, measure your 2.9K resistors, and select one
that is on the low side of IT'S tolerance. For instance, if your
resistors are 5% units, they can be anywhere from 2.755 to 3.045K ohms.
Andy Wander

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ] On Behalf Of Chuck Merja
Sent: Tuesday, November 22, 2011 6:00 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
<mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ; geckodrive@yahoogroups.com
<mailto:geckodrive%40yahoogroups.com>
Cc: 'Chuck Merja'
Subject: [CAD_CAM_EDM_DRO] GECKO resistors

I got my G540 and see that I need some resistors across the 1 and 5 pins
on
each motor drive. The motors are 2.8 ohm, so I need 2800 ohm resistors.
I
have 2900 and 2200 - is it ok to use the 2.9K?
thanks

Chuck Merja



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